FAQ

Please check the following product troubleshooting information before calling the request service, follow these instructions, may be able to solve the problem of your products

What is the brightness, viewing angle and wavelength of the LED?
Q: What is the brightness, viewing angle and wavelength of the LED?
A: Luminous Intensity is equal to the amount of luminous flux emitted into a very small solid angle at a defined angular orientation from the light source. The measurement for luminous intensity is the candela. Symbol is Iv.
Viewing Angle is the total cone angle in degrees encompassing the central, high luminous intensity portion of the LED beam from the on-axis peak to the off-axis point where the LED intensity is 50% of the on-axis intensity. This off-axis point is known as theta one-half (θ 1/2). Two times θ1/2 is the LEDs' full viewing angle; however, light is visible beyond theθ1/2 point.
Wavelength is the distance between two points of corresponding phase and is equal to waveform velocity divided by frequency. It defines what color human eyes could recognize.

Q: What is dominant wavelength? Please specify the ranges of wavelength in red, green and blue color
A: Dominant wavelength is defined as the best range of wavelength showing the most natural color recognized by human eyes. Researches indicate that fixed colors with wavelength of 620-630nm (red), 520-530nm (green) and 460-470nm (blue), in fact mixed in a particular proportion, can get the pure white. That is, in display field, people use luminous materials with above wavelength to make "compounded" white more natural.
In order to get a good balance white led display, we specify the led colors with wavelength within 4nm for each color.

Q: How much will the brightness of LED drop down after 1000hrs?
A: Based on the result of aging test, the brightness decay of green LED is around 5%-8%, while blue is around 10%-14% and red is around 5%-8％.
What is virtual pixel, real pixel？
Simply, real pixel is each LED of three red-green-blue LED which constitute a screen display is only involved in the use of an imaging pixel, in order to obtain sufficient brightness
Virtual screen is to use software algorithms to control the LED of each color to participate in the final number of adjacent pixels of the image, making the lamp with less LED to achieve greater resolution, it can increase about four times resolution.
As we all know, the largest cost is Led chip for Led display, one of our target is that we can save the cost but do not less the brightness. The virtual technology is a development direction. The virtual technology is not a simple tube to participate in imaging, it impact much for the brightness, gray. It requires the control system coordinate with the driver chips, to use the software algorithms and driver chips to combine response time, to save the Led cost but do not less the brightness.

What is dynamic display and what is static state display？
Static screen is corresponding to the scan screen, static screen is the LED display in the display text, images, video, LED lights on display is lighted at the same time.
it is not like the scan screen to use the person eye's temporary characteristics,Scan screen instead of using the human eye as the visual characteristics of temporary stay, to light each line of Led screen separately. As we all know, led display is drived by room ratio, the brightness is related to the light time. So, if the same brightness of Led, the brightness of static screen is more than scan screen. Therefore, a static screen is used for high-brightness and outdoor display, and scan screen commonly use for scanning screen which do not need the high brightness to save the driver cost.
However, with the LED materials technology is developed continuesly, brightness of LED is improved continuously. In order to save the cost, outdoor display also use scan driver. Of course, the high request for the control and driver when use scan driver for outdoor led display, also request the very high performance chips.

Life Time of our LED display
The life time for our LED screens is over 100,000 hours, but it depends how the client is taking care of his LED screen and how it is used. When a LED Screens´ life time will get to 100,000 hours, it means that the brightness of the LED´s of the LED screen is about 50% of it´s original brightness, depending on several factors that will enlarge a LED screen´s life time or reach 100,000 hours.

The most important factors are, which are:
1:LED Screen Maintenance
2:LED Screen Temperature
3:LED Screen Power Protection
4:LED Chip Packaging

LED Screen Maintenance
Maintenance is a very important factor, dusty environments require more often maintenance to the LED screen than clean environments. The soldering of the LED chips can dry out and break which require changing often pieces like LED modules and receiving cards.

LED Screen Temperature
The temperature of the LED screen is very important to keep it cool. In hot environments it is wise to install a cooling system inside the LED screen to avoid overheating.

LED Screen Power Protection
Electrical peaks can put more force on the electrical components which will decrease life time. It is wise to install a protection that can control the peaks.

LED Chip Packaging
The LED chip packaging material is also a very important variable that will determine the lifetime of a LED screen. For example iron has less life than cuprum LED packages. Besides iron is more corrosive than cuprum.

What are the common faults about LED display ?
The entire screen jitter
One is LED control card, multimedia card address is incorrect, or the network cable is good pressure, re-adjust or replace. Another, such as the entire screen with a slight jitter phenomenon is due to insufficient power supply LED display, measurable power is normal, if the supply voltage drops below 180V, please adjusted properly, such as LED display power supply voltage is normal, please contact a professional engineer Contact.

No signal output
The reason is LED display control card voltage is not normal, check the network cable is not the correct pressure method, commonly used 568B pressure method, and then the cards to send cards and receiving cards, the voltage to normal, if not enough is the LED display control card The problem, replace.

The local display panel does not light, and subsequently are a long bright line

One reason to the board does not provide 5V voltage, that is a power failure, you can turn off the screen, measure 5V power supply and GND are shorted. Normal value is usually 15Ω or so, if less than 12Ω can be considered short, find out where the short circuit, if negative value is normal, indicating that the power supply is broken, to be replaced in it.

Full-screen bright line
The reason is LED display control computer crash or power, LED display control card is not power, control of the computer to restart.

If the opening screen instantly total gate trip distribution box
One reason for the electronic screen control switch distribution box is too small, the replacement of the control switch, the second is connected to the display 220V line short-circuit, short-circuit check out the place, let it not short-circuit can be.
Sixth, two-line display unit board does not shine

The reason is not normal line pipe 4953, must check and replace.

Seventh, LED full color display failure:
1. If the screen appears all white or Huaping Approach: (1) Re-install the graphics driver (2) confirm the signal cable is plugged.
2. If the display appears completely black Check that the power is turned on.
3. If the screen Huaping a region

Check the display behind the flat cable is plugged in reality. Indoor screen appears as a line lit or not lit, the display panel is faulty transistor.

How to choose Small Pixel LED screen?
Small Pixel LED screen is getting popular with its delicate and fine image quality, but how to choose a quality small pixel LED screen to achieve the max value?

Low brightness and high grey scale
To make sure the eyes will be not hurt by LED screen, user need to pay attention to the brightness when purchase it. In the tradition LED technology, to lower the brightness will cause loss of grey, which will directly affect the image quality, hence the most important standard of High quality small pixel LED screen is to achieve low brightness and high grey scale.

Balance effect and technology
Comparing to traditional LED screen, the outstanding feature of small pixel LED is smaller pixel pitch. In the application, the smaller pixel pitch, the denser to be suitable to view closely and vice versa.

There is a best view distance of small pixel LED screen to achieve the best visual effect. The smaller pixel pitch, the higher cost of LED screen, so user needs to comprehensively consider cost, demands, and applications etc factors.

Resolution option to match with rear-end signal
To small pixel LED screen, the smaller pixel pitch, the higher resolution, the clearer image quality. But in the operation, user needs to pay attention to its resolution as well as match its rear-end signal when make its display system.
How to Repair IC and LED

According to attachment B,If it is sure that IC is bad,change directly by searing-iron

If finding several LEDS not light or always light,take out the module and examine,If LEDS is bad,the outdoor consumer operates by the following instruction,while the indoor cusumer changes it directly by searing-iron.

1) Take out the screws in the surface by screwdriver,then take out the surface

2)Find out the ill LED,test LED by the one that test diode in the multimeter
Test again and again(pay attention to the anode and cathode) If it can't light ,It is ill LED.(The LED in the picture is good)

3) Being sure the location of the LED, take out the glue around the LED by plier and some other tools(be careful to the line under LED and not to attaint it) Then pick up the ill LED by plier,brand iron and other tools.

4) Take out LED from the store,test it by multimeter.Then cut out the excrescent foot by wire cutter,leaving only 6 to 7mm length.Then install the LED by brand iron,plier and other tools.(pay attention to the anode and the cathode,usually the andoe have a longer foot and PCD quadrate hole)

5)After install ths LED,make sure the whole module works well,Pressurize the exposed place by electro-gluing water,to protect it from rain and against the corrasion to the oxidation-line-board.(If the customes have no electro-gluing water,they can use other gluewater instead,only for function of waterproof and airproof)

6) Install the surface and finish the maintenance